Spool for photographic roll films



Febl 17, 1931. H. c. RICH 1,792,709

SPOOL FOR PHOTOGRAPHIC ROLL FILMS Filed Jan. 22, 1929 Attorneys .77? vamtoz- Patented Feb. 17, 1931 were s'rrss HERBERT CHARLES RICH, 0F BEDFORD, ENGLAND SPOOL FOR PHOTOGRAPHIC ROLL FILMS Application filed January 22, 1929, Serial No. 334,219, and in Great Britain January 24, 1928.

This invention relates to spools for photo graphic roll films of the kind comprising a slotted cylindrical barrel madefrom asheet metal blank, metal discs or plates secured to the ends of said barrel and in some cases guide means which facilitate the passage of the film backing paper through the slots in the barrel. V

The object of the present invention is to provide an improved and simplified construction of such metal spools enabling the production to be effected by a minimum number of simple pressing operations.

According to the present invention, the barrel of the spool is formed from a substantially rectangular metal sheet blank whose end parts are of reduced width so that after bending into cylindrical form the resultant barrel has ends of reduced diameter. The metal discs or end plates are formed with sleeve or collar like flanges on their inner peripheries, these being adapted to take over the reduced ends of the barrel Whilst the connection of the parts is made secure by In the accompanying sheet of illustrative ing through gaging a film,'a strip of paper or other fabric L drawings, I

Fig. 1 is a plan of a sheet metal blank from which the spool barrel is formed according to this invention,

Fig. 2 is a side elevation of the spool barrel,

Fig. 3 is a longitudinal section of the complete spool, and

Fig. 4 is a perspective View of the same, with a portion of the barrel removed.

Fig. 5 is a section of a slightly modified detail and Fig. 6 is a perspective View, partly n section, of a further modified detail, to a slightly larger scale.

As shown in the drawings the sheet metal blank a is substantially rectangular in shape 59 but has'end portions a of reduced width.

Two longitudinal slots 1), 6 formed in the blank serve inthe finished spool for the passage of the film backing in the usual way. lVhen the blank a is rolled to cylindrical form as shown in Fig. 2 the ends a of reduced diameter connect with the main porfor the'various widths of film. The metal discs or end plates d for the spool which maybe constructed as shown in Fig. 3 or Fig. 5 or of other sutiable shape are flanged at the inner edge thus forming sleeves or collars e adapted to fit snugly upon the 'reduced ends a of the barrel Where they are lined tightly by'a 'wedging or expanding action set up by forcing slightly tapered metal bushes f, 7 into the hollow ends of the barrel. The bush f at one end of the spool is slotted diametrically at its outer end asshown at f to permit of its operative connectionwith a film winding key and if desired the end of the barrel blank may be notched at the points a? which come in line with said slots; Preferably the bushes would be stamped out of sheet metal as shownin Fig. 6 and in this case the strips of metal displaced to formthe slot f are pressed inwardly to constitute bearing surfaces for the film winding key,

as shown at F, each of said strips remaining attached to the-bush along one of the edges of one half of the slot. 7

To facilitate the passage of the film backthe slots in the barrel when en 9 may be passed through the slots 79, b and laid around'the barrel 0 at one side of the slots as shown in Fig. i and fixed by an adhesive or like means. If desired two such guide strips may be provided and laid around the parts of the barrel 0 on opposite sides of the slots 5, b, but where the slots are arranged in close proximity instead of diametrically opposed, one guide strip only is sufficient, this being laid around the larger portion of the barrel to one side of the slots. spools, however, the guide strips may be omitted altogether.

I claim:

1. A spool for photographic roll films com.-

In some prising a tubular metal barrel formed with longitudinally extending slots, a portion of reduced diameter at each end of said barrel, metal end discs, a concentric collar pressed out at right angles from each of said end discs and adapted to fit over one of the reduced ends of the barrel to bring the corresponding end disc substantially flush with the said end of the barrel and apertured metal bushes adapted to be forced into the ends of the barrel to expand the same within said collars.

2. A spool for photographic roll films comprising a tubular metal barrel, a pair of longitudinal slots therein adapted to co-operate with a film backing for securing a film to said barrel, a portion of reduced diameter at each end of said barrel, metal end discs, a concentric collar pressed out at right angles from each of said end discs, said collars being substantially equal in length to the reduced portions of the barrel and adapted to fit over same to bring the end discs substantially flush with the ends of the barrel, and apertured metal bushes adapted to be forced into the ends of the barrel to expand the same Within said collars.

3. A spool for photographic roll films comprising a tubular metal barrel reduced in diameter for a short distance from each end to provide a shoulder adjacent each of said ends, metal end discs, concentric collars extending at right angles from said end discs for a distance substantially equal to the length of the reduced portions of the barrel and adapted to be fitted over said reduced portions to abut by their free ends against the shoulders on said barrel,-and tapered apertured metal bushes adapted to be forced into the ends of the barrel to expand the same within said collars.

i. A spool for photographic roll films according to claim 3, including longitudinal slots in the tubular metal barrel and a fabric strip extending through said slots to form a guide for a film backing strip.

5. A spool for photographic roll films according to claim 3, wherein the bushes and end discs comprise pressings from sheet metal.

In testimony whereof I affix my signature.

HERBERT CHARLES RICH. 

